1. indicates passive voice (incl. the "suffering passive")See also 迷惑の受身 めいわくのうけみ, れる for 五段 verbs, られる for 一段 verbs. After the -nai stem of a verb
2. indicates the potential formSee also 可能動詞 かのうどうし, no imperative form, only on 一段
3. indicates spontaneous occurrenceno imperative form
4. used as an honorific for others' actionsHonorific or respectful (sonkeigo), no imperative form
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